In Namibia, MycoHAB is hoping to solve two issues for the price of one: make use of a pesky plant known as the encroacher bush and deal with the country's housing crisis. By harvesting the water-intensive weeds that encroach on farmland and combining them with a mushroom byproduct known as mycelium, MycoHAB founder and architect Chris Maurer creates bricks to build homes. The World's Carolyn Beeler spoke to Maurer to learn more.